//
// Copyright 2018-2020 Amazon.com,
// Inc. or its affiliates. All Rights Reserved.
//
// SPDX-License-Identifier: Apache-2.0
//

import os.log
import UIKit
import SwiftUI

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    func scene(
        _ scene: UIScene,
        willConnectTo session: UISceneSession,
        options connectionOptions: UIScene.ConnectionOptions
    ) {
        // Use this method to optionally configure and attach the UIWindow `window` to the
        // provided UIWindowScene `scene`. If using a storyboard, the `window` property
        // will automatically be initialized and attached to the scene. This delegate does
        // not imply the connecting scene or session are new (see
        // `application:configurationForConnectingSceneSession` instead).

        // Create the SwiftUI view that provides the window contents.
        let contentView = ContentView()

        // Use a UIHostingController as window root view controller.
        if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)
            window.rootViewController = UIHostingController(rootView: contentView)
            self.window = window
            window.makeKeyAndVisible()
        }
    }

    func sceneDidDisconnect(_ scene: UIScene) {
        // Called as the scene is being released by the system. This occurs shortly after
        // the scene enters the background, or when its session is discarded. Release any
        // resources associated with this scene that can be re-created the next time the
        // scene connects. The scene may re-connect later, as its session was not
        // neccessarily discarded (see `application:didDiscardSceneSessions` instead).
    }

    func sceneDidBecomeActive(_ scene: UIScene) {
        // Called when the scene has moved from an inactive state to an active state. Use
        // this method to restart any tasks that were paused (or not yet started) when the
        // scene was inactive.
    }

    func sceneWillResignActive(_ scene: UIScene) {
        // Called when the scene will move from an active state to an inactive state. This
        // may occur due to temporary interruptions (ex. an incoming phone call).
        OSLog.subscription.log("\(#function), unsubscribing", log: .subscription)
        AppSyncRTCProvider.default.unsubscribe()
    }

    func sceneWillEnterForeground(_ scene: UIScene) {
        // Called as the scene transitions from the background to the foreground. Use this
        // method to undo the changes made on entering the background.
    }

    func sceneDidEnterBackground(_ scene: UIScene) {
        // Called as the scene transitions from the foreground to the background. Use this
        // method to save data, release shared resources, and store enough scene-specific
        // state information to restore the scene back to its current state.
    }

}
